Pressure-gage.



1.'L.NILS0N al1. PRINCE.

PRESSURE GAGE APPLICATION .F.ILED JAN. 29. 19H.

Patented Aug. 6, 1918.

mln/ms f U NITED STATES PATENT OFFICE.

JOHN L.NILSON AND JOHN PRINCE, 0F CHICAGO, ILLINOIS. l

To all whom t may concern:

Be it known that we, JOHN L. NILsoN and.4

JOHN PRINCE, citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Pressure- Gages, of which the following is a specifi- Our invention relates to pressure gages and has particular reference to air-pressure gages `adapted to be interposed between the ends of and in an air tube to register the degree of pressure between its source and where it is applied, as in connection with automobile and bicycle pumps.

They general objects ofthe present invention are to reduce the amount of material now required for the manufacture of these devices; to simplify construction; to lighten the weight; to make more compact for toolbox storin g purposes; to strengthen the construction; to arrange for ia construction which gives a protected position of the gage in the tool-box; to position the gage on the air-tube, tion, so as to make. it more conveniently readable to the operator of the air pump; to make more convenient the crimping of the air-tube ends, or the ferrules thereon, to the nipple ends; to reduce the length and work of boring of the latter; to cause the air-tube ends to act as vstops which hold the body of the casing and its cap or cover t0- gether, andto provide such other improvementsincidental tothe general construction and arrangement as will hereinafter appear from the subjoined description, the accom'- i cluding the tube paiiying drawings and the appended claims.

The present invention therefore consists 'm the novel construction, combination and arrangement of parts, all as hereinafter described in detail, illustrated in the accompa-nying drawing, and more particularly pointed out in the appended claims.

In the drawing- Figure 1 is a perspective lview of our improved gage interposed in a section of airtube, and showing its readable position to a liand-pump operator, as well as the .body and cover holding means for the case provided by our improved arrangement of the abutting tube-ends.

" Fig. 2 is a vertical section of Fig. 1, inand gage.

Fig.` 3 is a section taken substantially on line3-3 of Fig. 2.

Specification of Letters Patent.

in which it is interposed as a sec- Vrmissumi-einen.l

Fig. 4 -is a perspective 4view showing the improved connection of nipple, or nipples, or nipple-ends, with the hollow gage spring of the Bourdon type of pressure gage,

which places the nipple portion of the air# passage, or the air-tube, within the circle of the peripheryv of the gage case to preserve y Patented Aug. 6, 19,18. Application ledlanuary 29', 1917. Serial No. 145,054'.

is the elimination of some metal, interme-ll diate and space-occupying parts, and intermediate borings or passages between the metal tube, or double-,ended nipple. Fig. 4

also 'shows the bearing-arinfor the pointer as a simple projection from the nipple itself.

In the several views 2 represents the body of the usual form of cylindrical casing provided with the usual cover, or cap, 3; 4 is a nipple with grooved ends 5 and 6 to which are attached flexible air-tube sections 7 and 8 ordinarily fastened by ferrules 9 and 10 that are crimped onto the tube ends, the improved accessibility for the crimping tool or instrument being also a featurev of the present improvement. Preferably as sube stantially an integral part of the nipple 4 is a bearing arm 11 having an apertured bearing portion 1 2 for a spindle 13 .carrying a pointer 14 which traverses graduations 15 on a semi-circular dial 16 that is fastened by a single screw that has threaded engagement with an apertured hub 18 which forms the terminus of the arm 11. This arm 11 may be soldered ontol the part 4,

cast integral therewith, or made a part thereof by any of the well known means available to manufacturers. To the middle portion of the nipple 4 is attached at right vangles the inlet end of the usual hollow and' curved gage spring 19 on the free end of which is an apertured ylug 20 that is pivoted to one endof a link 21, .the other end of which is pivoted at 22 to the free end of' an elbow 23 on the pointer 14. Like the arm 11 the spring 19 may part 4 by any of the well known means, such as soldering or brazing. The bore 24 of the nipple is in communication with the bore 25 of the gage spring to the free end of which movement is imparted through air or fluid'pressure in the space be attached to the 25 tending to g Leraar@ 'substance such as glass, mica 0r Celluloid 27 which is riveted to, or otherwise secured to the cover top by a fastener 28. The body 2 of thecasing is secured to the arm 11 by means of screws 29 and 30 which engage screw holes in the bottom of the casing and thread holes in the under sideof the arm 11.

In the p revailing forms of constructioin* `modified 1n numerous Ways,-adapted forthe present general purpose, as distinguished from terminal gages which register pressure at the point where it is applied, the doub1e-ended nipple 4 is arranged outside of the casing 2 and is provided with a branch or coupling with a by-pass therein. This branch occupies, substantially, the position of the bearing arm 1l in the tion, enters through an opening in the pe'- riphery of the casing, and is provided with more or less complicated, expensive and difiicult to make connections with the outlet shown in Fig. 3 in section which exposes the said passage. In' such prevailing forms of construction the nipple 4 also occupies a position at right angles to its position herein shown, that is, its long axis is parallel to the plane of the dial, which places the dial on ed e, instead ofl faceupward, as in Figs. l an. gage inconvenient and awkward. 0n the other hand'v such construction places the easily breakable face or sight portion of thel gage either up or down in the tool-box when the flexible tube 7 and 8 is coiled into said box, in which position the weight of other tools inthe box often cause damage to the gage. vIn the present construction f when the air tube is coiled around the gage,

it 1s automatically placed on edge in the tool box, when the. coiled tube is laid flat or tends to assume that position. The old forms of construction of gages' for this urpose generally sever the circular or peripheral bad portion of the casing 2. When the nipple 4 extends tangentially from the circular side of the casing 2, it elongates the nipple. This requires more room, material and labor in boring. A projection of the T connection whichenters the casing far beyond the edge of the casing makes the gage and its nipple undesirably bulky, heavy and expensive in the amount of material used. Such lengthening or projection.

present inven- 2, and makes the reading of the.

of the nipple is in such construction necessary to avoid the cramped and substantially wedge-shaped spaces between the straight nipple and the circular casing side into which the tube ends could not beentered,

top and bottom of the casing free accessibil- .ity for the attachment of the tube sections 7 and 8, and for crimping the ferrules thereon, is provided. The ferrules are also caused to serve as means for locking the casing body and its cover together against accidental separation. Only to the extent of the comparatively small depth of the casing 2 is the entire length of the nipple t made unavailable for engagement with the air-tube sections. This permits the .use of a considerably shorter nipple than Where it must cross the diameter of the casing or be positioned tangentially to its rim,-an important saving in an article soldat, say, in the neighborhood of a quarter of a dollar apiece;

Having thus described our invention, We claim as new and desire to secure by Letters Patent- 1.' The combination in a gage of the class described, of a nipple which extends through .said cover in positlon on the body of the casing.

. 3. The combination in a gage of the class described and its spring and casing, of a nipple having hose or tube-engaging ends projecting from, respectively, the top7 and bottom of said casing, and an intermediate portion which connects directly with the gage spring and supports the' body 'of the casing and its mechanism on said nipple.

In testimony whereof We have hereunto y slgned our names.

JOHN L. NILSON. JOHN PRINCE. 

